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Lorden's inequality : ウィキペディア英語版
Lorden's inequality
In probability theory, Lorden's inequality is a bound for the moments of overshoot for a stopped sum of random variables, first published by Gary Lorden in 1970. Overshoots play a central role in renewal theory.〔
==Statement of inequality==

Let ''X''1, ''X''2, ... be independent and identially distributed positive random variables and define the sum ''S''''n'' = ''X''1 + ''X''2 + ... + ''X''''n''. Consider the first time ''S''''n'' exceeds a given value ''b'' and at that time compute ''R''''b'' = ''S''''n'' − ''b''. ''R''''b'' is called the overshoot or excess at ''b''. Lorden's inquality states that the expectation of this overshoot is bounded as
::\operatorname E (R_b) \leq \frac.

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